Feeding mechanism for shaker or



girly/Ilz 2 Sheets-Sheet l @w HK m INVENTOR Frhs BY ATTORNEY FEEDINGMECHNISM FOR SHAKER OR JIGGING JONVEYERS Oct.

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e ATToRNg-LS' Reissued Oct. 27, 1942 UNITED STATES PATENT OFFICE FEEDINGMECHANISM FOR SHAKER R JIGGING CONVEYERS f Ernst R. Bergmann, EvergreenPark, Ill., assigner to Goodman Manufacturing Company, Chicago, Ill., acorporation of Illinois 16 Claims.

This invention relates to improvements in feeding mechanisms for shakeror jigging conveyers of the type utilized for picking up andtransporting loose material such as coal. rock, or the like.

The principal objects of my invention are to provide a novel andsimplified form of feeding device of the friction grip type, adapted toautomatically extend or retract an extensible trough section withrespect to a reciprocating trough section of a shaker conveyer, solelyby reciprocable movement of the conveyer, which is of a more compactarrangement than formerly and includes a simpler means for actuating thegripping mechanism and controlling feeding of the extensible troughsection in either direction.

Other objects of my invention will appear from time to time as thefollowing specification proceeds, and with reference to the accompanyingdrawings wherein:

Figure 1 is a plan view of the in-by end of a shaker conveyer troughline having a feeding device constructed in accordance with my inventionassociated therewith;

Figure 2 is an enlarged fragmentary View in side elevation of the deviceshown in Figure 1, with certain parts broken away and certain otherparts shown in longitudinal section;

Figure 3 is a plan view ofthe device shown in Figure 1, drawn tosubstantially the same scale as Figure 2, with certain parts broken awayand certain other parts shown in horizontal section, in order to moreclearly illustrate certain details of my invention;

Figure 4 is a sectional View taken substantially along line 4-4 ofFigure 3,'

Figure 5 is a fragmentary sectional view taken substantially along line5--5 of Figure 1; and

Figure 6 is a fragmentary sectional view taken substantially along line6 6 of Figure 3.

In the embodiment of my invention illustrated in the drawings, the mainelements thereof include a reciprocating trough section Ill connected tothe forward end of a shaker conveyer trough line (not shown). Anextensible trough section or pick-up member II is adapted to betelescopically extended or retracted with respect to said reciprocatingtrough section and is provided with a forwardly projecting ared shovelI2 at its forward end, which is adapted to rest on and slidably movealong the ground.

The extensible trough section or pick-up member Il is supported abovethe ground at its rear mounted thereon on a transverse shaft I5. Theupper ends of said legs extend upwardly along opposite sides of saidextensible trough section and are secured to opposite upper bearingplates I6, IE, extending along and projecting laterally from the uppersides of said extensible trough section. The entire weight of saidextensible trough section thus rests on the ground on the A shovel I2 atits forward end and on the shoe I3 at its rear end. l

The reciprocating trough section Ill is supported at its forward end forfree reciprocable movement along said extensible trough section andguided against vertical displacement with respect to said trough sectionby means of two pairs of rollers I'I, Il, Said pairs of rollers aremounted on opposite sides of the forward end of a bracket I8 secured tothe forward end of said reciprocating trough section. Said bracketextends around the bottom and upwardly along opposite sides of saidreciprocating trough section. The lower of said pairs of rollers isadapted to be engaged by the underside of the bearing plates I6, I6,which extend laterally fromthe upper flanges of said extensible troughsection and form a rolling support therefor, and the upper rollers ofsaid pairs of rollers are spaced upwardly from said bearing plates andare adapted to prevent upward movement of said extensible trough sectionwith respect to said reciprocating trough section. Said bracket likewiseforms a mounting for the mechanism for extending or retracting saidextensible trough section with respect to said reciprocating troughsection, which mechanism is herein shown as being disposed beneath saidreciprocating trough section.

Referring now in particular to the novel form of feeding mechanism of myinvention, a bearing bar 20 is herein shown as being secured to theunderside of the extensible trough section Il and extendinglongitudinally along the longitudinal center thereof. Opposite faces ofsaid bearing bar are adapted to be engaged by a pair of friction gripblocks 2I and 22, for extending or retracting said extensible troughsection with respect to said reciprocating trough section. Said gripblocks are mounted in a carrier member 23, herein shown as extendingtransversely of the conveyer. A plate 24 extends forwardly Said boss hasan arcuately formed face which is adapted to engage a correspondingarcuately formed socket in the inner end of a block 2. Said block ismounted in said carrier member for slidable movement with respectthereto in a guide generally indicated` by reference character 29. A setscrew 3b, threadedin an end of said carrier member, engages the end ofsaid block opposite from the grip block 2|, to form an adjusting memberfor said grip block. l

The opposite grip block 22 is provided with an arcuately formed boss 33projecting from its edge opposite from said bearing bar. Said boss isadapted to engage a corresponding varcuately formed socket in thecarriermember 23.

A pair of links 35 and 36, pirotally connected to the carrier member 23adjacent oppositeends thereof, is provided to engage the grip blocks 2|and 22 with the bearing member 261, during certain strokes of theconveyer, to extend or retract the extensible trough section Il withrespect to Ithe reciprocating trough section It.

The link 351s ofthe spring link type, andits spring is of such strengththat under normal operating conditions, said link will act as a solidmember, but will yield whenthe forward end of the shovel I2 engages asolid obstruction, to prevent-buckling of the trough line or damage tothe feeding mechanism and conveyer drive. vSaid link consists of alongitudinally extending bolt 3'I` .slidably extending through a yoke.33, and abutting the inner side of said yoke at its head. Said kyoke ispivotally connected to a rearwardly and outwardly projecting arm 39 ofthe carrier membernZS and is yieldably held from movement with respect.to said bolt by means of a compressionspring 45, encircling said .boltand interposed between. said yoke and Va collar 4I. Adjustment of saidspring is effected by means of a nut 42 abutting the rear face ,of said`collar.

. Positioning of the link 35 to .an .operative or inoperative`positionis effected by means Yof anarcuate shaped link 45 .and arocking lever ,4E controlled by a hand lever 53. Said farcuately formedlink is pivotally connected to a yoke ,44, herein .shown .as beingthreaded on the end of said bolt opposite from the yoke 38. The`opposite end of said arcuateiy formed link is .pivotally connected tothe rocking .lever 4S, which is mounted Vat one of its ends on ,avertical rock shaft 4.9. ySaid shaft extends through the bracket IB atitsupper end and is mounted at its lower end in a bracket 4.7, hereinshown as being welded to the .bracket I8, and spaced below the portionof .said bracket through which the upper end of said shaft extends. Saidrocking lever has an arm 50, extending inwardly from the point ofconnection of said arcuate link thereto, to which is pivotally connecteda connecting link 5I extending, transversely of said extensible troughsection. The opposite end of said connecting link is pivotally connectedto `a lever arm 52 of the hand lever 53, whichis pivotally mounted on abracket` 54 by means of a vertical pin 55.

'The link 33, as herein shown, includes a yoke 55 threaded on one end ofa threaded member 5l and pivotally connected to the carrier member2.3,bymeans of a pivotalpin '58. A yoke 53 is threaded on the oppositeend of said threaded member and ispivotally connected to a forward endof an arcuately formed link Eil.' Suitable nuts, are provided to `locksaid yokesfrom movement kwith respect to `said threaded member. Theopposite end o'f said arcuately formed link is pivotally .connected tio.one .lever arm 16.! of .al hand lever G2. The function of said handlever and arcuately formed link is to position the link 3E in anoperative or inoperative position and hold it in such a position. Saidhand lever is mounted on a vertical rock shaft S4, disposed beneath theupper iiange of the reciprocating `trough section IUQand mountedintermediateits ends in a bracket 63, secured to the bracket member IS.

The carrier member 'i is urged in the for- Wardlyinclined position shownin Figure 3, by means of yieldable links 65 and 36 connected between thebracket I8 and opposite ends of the carrier ,member 23. The purpose ofsaid links is to urgethecarrier member 23 in the inclined position shownin Figure 3, one of said links being operativeiwhen feeding in onedirection and the other of .saidf4 links being operative when feeding inan opposite direction, to engage the grip blocks 2| and 22 with thebearing member 2U, the instant the forward or return stroke of the con-Veyer has been completed, depending `upon the direction of feeding, toprevent lost motion and slipping of said grip blocks during extension orretraction of said extensible trough section. These links, however,perform no feeding function but serve merely to position the grip blocksEI and 22 in a gripping position at `the beginning ,of ,the extending orretracting stroke of the conveyer, depending upon. the direction it isdesired to move said extensible trough section.

The link E5 is connectedibetween the arm 39 ofthe carrier member 123Vand a bracket Si, projecting outwardly from the bracket I8. Said linkis adapted to urge the end of said carrier member to which said springis connected in a forwardly inclined direction, and includes aconipression spring 68 encircling .a threaded rod '69 and interposedbetween a collar 'i0 adjacent one end of said bolt, and a block 'IIthrough which said bolt slidably extends. Said block is pivotallymounted on the bracket 61 in a usual manner. Adjustment of said springis effected by a nut 12, threaded on said bolt and abutting the forwardface of said collar.

The yieldable link 66 includes a threaded rod 16 having a bifurcatedforward end which is pivotally connected tothe end of the carrier member23 by means of a vertical pin 15. Said rod slidably extends through ablock 'I1 which is pivotally mounted on a bracket 18, projectinglaterally from the bracket I8. A compression spring 'I9 abuts the rearend of the block 'I1 at its forward end and is abutted by a collar 8l atits rear end to exert a pulling force on the end ofsaid carrier memberto which said spring is connected. A nut 83 abuts the rear end `of rsaidcollar and serves to eect adjustment of said spring.

The feeding mechanism is shown in a locked position in Figure 3, to lockthe extensible trough section II for movement with the reciprocabletrough section ID. When the mechanism is in this position, the'pivotalaxis of the pivot pins of the link 35 Will be in substantial alignmentwith the pivotal axis of the pivot pin 49 and the pivotal axes of thepivot pins of the link 35 will be in substantial alignment with thepivotal axis of the pivot pin 64. This will rigidly connect the carriermember 23 to the links 45 and 60 and lock the grip vblocks 2l and 22ywith the bearing bar 20, the spring links 65 and 66 being held in aninoperative position by the links 35 and 36. The extensible troughsection will thus reciprocabh7 move with the reciprocable 'troughsection upon reciprocation ofthe conveyor. When itis desired tolextendsaid extensible trough section from said reciprocating trough section,the hand lever 62 is swung outwardly, to move the arcuate link 60 fromthe position shown by full lines in Figure 3 to the position shown bybroken lines in this figure. This moves the link 36 in acounterclockwise direction about its axis of connection to the carriermember 23 to an inoperative position, and permits the spring lock 66 toexert a pulling force on the carriermember 23. When the hand lever 62 ispositioned as described above, the link 35 will exert a forward pushingforce on the carrier member 23 upon the forward stroke of the conveyer.This will tend to pivot said carrier member in a counterclockwisedirection upon the forward stroke of the conveyer and engage the gripblocks 2| and 22 with the bearing bar 26, to move the extensible troughsection forwardly with the reciprocating trough section l0. Upon thereturn Astroke of the conveyer, the link 35 will exert a pulling forceon said carrier member against the spring link 66, and tend to pivotsaid carrier member in a clockwise direction to permit the grip blocks2| and 22 to be disengaged from the bearing member 2D, and permit thereciprocating trough section to move rearwardly with respect to saidextensible trough section.

The extensible trough section, being wholly supported on the ground andsupporting theforward end of the reciprocating trough section, hassuicient frictional resistance against the ground to prevent itsmovement with said reciprocating trough section except when engaged bythe grip blocks 2| and 22, and to cause opening of the solid lines insaid iigure by said hand lever 62.

When the link 35 is in an ino-perative position and the link 36 is in adead center position with respect to the pins 58 and 64, as shown bysolid lines in Figure 3, the link 36 will tend to pivot the carriermember 23 in a clockwise direction r against the yieldable link 65 uponthe forward ystroke of the conveyer, and disengage the`grip blocks 2|and 22 from the bearing member 2|). Upon the return stroke of theconveyer, the link 36 will exert a pulling force on said carrier memberand tend to pivot said carrier member in a counter-clockwise direction,to engage said grip blocks with the bearing member 20 and retract saidextensible trough section with said reciprocating trough section.

When it is desired that the reciprocating trough section reciprocablymove along said extensible trough section, the levers 53 and 62 are bothmoved in an outward direction to position the links 45 and El! in thepositions shown by dotted lines in Figure 3 and render the links 35 and36 inoperative. When said links are in this position, the carrier member23 will be urged in the inclined position shown in Figure 3 by thespring links 65 and 66. The springs of said spring links, however, aresufficiently weak that they will permit the grip blocks 2| and 22 toopen and slide along said bearing `member, so the extensible troughsection may move along the reciprocating trough section.

It may be seen from the foregoing that a simplified feeding device of acompact and low overall height has been provided for a pick-up member ofa shaker conveyer trough line, which eliminates vertical swinging motionof the gripping parts during operation of the conveyer and utilizes oneset of grip blocks, disposed beneath the pick-up member or extensibletrough section of the conveyer, for feeding the extensible troughsection in either direction, and which is operated in a simple manner bythe manipulation of one hand lever for feeding the extensible troughsection in one direction and another hand lever for feeding it in anopposite direction.

While I have herein shown and described one form in which my inventionmay be embodied, it will be understood that the construction thereof andthe arrangement of the various parts may be altered without departingfrom the spirit and scope thereof. Furthermore, I do not wish to beconstrued as limiting my invention to the specic embodiment illustrated,excepting as it may be limited in the appended claims.

I claim as my invention:

l. In a shaker conveyer, two trough sections, one of which is extensiblewith respect to the other, a carrier member, gripping means mounted onsaid carrier member, means pivotally connected between one troughsection and one end of said carrier member, for exerting a positiveforce on said carrier member to feed said other trough section in onedirection, means pivotally connected between said trough section and anopposite end of said carrier member for exerting a force on said carriermember to feed said trough section in an opposite direction when saidfirst mentioned means is rendered inoperative, and individual controlmeans for said engaging means adapted to render either one of saidengaging means inoperative.

2. In a shaker conveyer, two trough sections, one of which is extensiblewith respect to the other, a carrier member, gripping means mounted onsaid carrier member, two links pivotally connected between one of saidtrough sections and opposite ends of said carrier member, means formoving one of said links in position to engage said gripping means withsaid other trough section upon certain strokes of the conveyer, forfeeding said trough section in one direction, and means for moving theother of said links in position to engage said gripping means with saidother trough section upon certain other strokes of the conveyer whensaid rst mentioned link is inoperative, for feeding said trough sectionin an opposite direction.

3. In a shaker conveyer, two trough sections, one of which is extensiblewith respect to the other, a carrier member, gripping means mounted onsaid carrier member, two links pivotally connected between one of saidtrough sections and opposite ends of said carrier member, one of saidlinks being adapted to engage said gripping means with said other troughsection upon oertain strokes of the conveyer, for feeding said troughsection in one direction, and the other of said links being adapted toengage said gripping means with said other trough section upon certainother strokes of the conveyer, for feeding said trough section in anopposite direction, and individual control means for rendering either ofsaid links inoperative.

4. In a shaker conveyer, two trough sections, one of which is extensiblewith respect to the other, a carrier member, gripping means mountedonsaid carrier member, two links Apivotally connected :between one of saidtrough sec- 'tions .and opposite ends of .said carri-er rmember, one ofsaid links being adapted to engage said rgripping means withsaidothertrough section upon certain ystrokes of the conveyor, for :feeding saidtrough section in one direction, and the other of said linksbeingadapted 4to vengage said gripping means With -said other troughsection upon certain .other strokes of the conveyer, for feeding saidtrough section in an opposite direction, yieldable means havingconnection with opposite ends of said carrier member for urging ysaidcarrier member in a position toengage said gripping means with saidother trough section, and individual control means for rendering eitherof said links inoperative and permitting the other link to feed saidextensible :trough `section in the desired direction.

5. In a feeding device kfor shaker conveyors, two trough sections, oneof which is extensible with respect to the other, `means operable.solely by the action of the conveyer dueto frictionalresistance of theextensible trough section on the ground, for extending or retractingsaid extensible trough section with respect vto said other troughsection includinga carrier member, `a pair of .grip blocks carried bysaid carrier member, means pivotally connected between one troughsection and one end of .said carrier member and operable to exert, aforce on one end of said car- -rier member in a direction to cause saidcarrier member to engage said grip blocks with said ex- Ttensible troughsection upon certain Astrokes of the conveyor, to feed said extensibletrough section with respect to the other trough section in onedirection, and other means pivotally connected between said troughsection and anvopposite end of said carriermember and operable to exerta force on an opposite end of said carrier member in a direction tocause said carrier member to engage said grip blocks with saidextensible trough section upon certain other strokes of the conveyer, torfeed said extensible trough section in an opposite direction, andindividual ycontrol means for rendering either one of said engagingmeans inoperative including a pair of hand levers and-connections fromsaid hand levers to said engaging members.

6. In a feeding device for shaker conveyors, a reciprocating troughsection, an extensible trough section, and means operable solely by theaction of the conveyer due to frictional resistance of said extensibletroughsection with the ground, `for extending or retracting saidextensible trough section with respect to ,said reciprocating troughsection including a carrier member, a pair of grip blockspivotallycarried by said `carrier member, a bearing bar extending al-ong saidextensible `trough section, means pivotally connected between saidreciprocating trough section and one end of said carrier member for`exerting a force on one end of said carrier member in a direction toengage ysaid grip blocks with said bearing bar upon certain strokes ofthe conveyer and feed said extensible trough section in one direction,means pivotallyconnected between said reciprocating trough section andan opposite end of said carrier member for exerting a force on the otherend of said carrier member in a direction to engage said grip blockswith said bearing ybar upon certain other strokes of vthe conveyer, forfeeding said extensible trough section in-an opposite direction, andindividual control means for ren- ,reciprocating trough Atrough section,and means operable solely by the :dering yeither of said engaging meansinoperative.

'7. In ,a feeding device for shaker conveyors, a section, an extensible`action ofthe conveyer due to frictional resistance of said extensibletrough section with the ground, for extending or retraOting said exten-,sible trough section with respect to said reciprocating trough sectionincluding a carrier member, a pair of grip blocks pivotally carried bysaid carrier member, a bearing bar extending along said extensibletrough section, means connected between said reciprocating troughsection and carrier member and selectively operable to exert a force onone end of said carrier member in a direction to engage said grip blockswith said bearing bar upon certain strokes of the conveyer and feed saidextensible trough section in one direction, other means selectivelyoperable to exert a force on the other end of said carrier member in adirection to engage said grip blocks with said bearing bar upon certainother strokes of the conveyer, for feeding said extensible troughsection in an opposite direction when said rst mentioned means isinoperative, and yieldable means connected'with opposite ends of saidcarrier member, to urge said carriermember to an inclined position topermit said gripping means to engage said bearing bar.

8. In a. feeding device for shaker conveyors, a reciprocating troughsection, an extensible trough section, and means operable solely by theaction of the conveyor due tofriction resistance of said extensibletrough section with the ground, for extending or retracting saidextensible trough section with respect to said reciprocating troughsection including a carrier member, a pair of grip blocks pivotallycarried by said carrier member, a bearing -bar extending along saidextensible trough section, means connected between said reciprocatingtrough section and carrier member for exerting a force on one end ofsaid carrier member in a direction'to :engage said grip blocks with saidbearing bar upon certain strokes of the conveyor and feed saidextensible trough section in one direction, means exerting a force onthe opposite end of said vcarrier member to engage said grip blocks withsaid .bearing bar upon certain other strokes of the conveyer, forfeeding said extensible trough `section in an opposite direction,yieldable means having connection with opposite ends of said carriermember, to urge said carrier member to an inclined position to permit`said gripping means to engage said bearing bar,

and individual control means operated from one side ofthe conveyor, torender either of said engaging means inoperative and control thedirection of feeding movement of said extensible trough section.

9. In a feeding device for shaker conveyors, a reciprocating troughsection, an extensible trough section, and means operable solely by themember in a direction to engage said grip'blocks with said bearing barupon the forward strokes of the conveyer, or selectively move said linkto an inoperative position, another link pivotally connected betweensaid reciprocating trough section and the opposite end of said carriermember, manually operable means. to position said link to exert a forceon said carrier member in a direction to engage said grip blocks withsaid bearing bar upon the return strokes of the conveyer or selectivelymove said link to an inoperative position.

10. In a feeding device for shaker conveyers, a reciprocating troughsection, an extensible trough section, and means operable solely by theaction of the conveyer due to frictional resistance of said extensibletrough section with the ground, for extending or retracting saidextensible trough section with respect, to said reciprocating troughsection including a bearing bar' extending along said extensible troughsection, a carrier member, a pair of grip blocks pivotally carried bysaid carrier member, a link pivotally connected between saidreciprocatingl trough section and one end of said carrier member,manually operable means to position said link to exert a force on oneend 'of said carrier member in a direction to engage said grip blockswith said bearing bar upon the forward strokes of the conveyer, orselectively move said link to an inoperative position, another linkpivotally connected between said reciprocating trough section and theopposite end of said carrier member, manually operable means to positionsaid link to exert a force on said carrier member in a direction toengage said grip blocks with said bearing bar upon the return strokes ofthe conveyer, and yieldable means connected between said reciprocatingtrough section and pposite ends of said carrier member to urge saidcarrier member to an inclined position to engage said gripping meanswith said bearing bar immediately upon the feeding stroke of theconveyer.

11. In a self-loading device for shaker conveyers, two reciprocatingtrough sections, one of which is extensible with respect to the other,and means for moving said extensible tro-ugh section relative to saidother trough section including a carrier member disposed beneath andextending transversely of said extensible trough section and havinggripping means thereon engageable with said extensible trough sectionduring certain strokes of the conveyer, iand means pivotally connectedbetween said other trough section and opposite ends of said carriermember and selectively movable to positions to transmit a positive forcefrom said trough section to either end of said carrier member, toextensibly or retractibly move said extensible trough section withrespect to said other trough section.

12. In a self-loading device for shaker conveyers, a reciprocatingtrough section, an extensible trough section mounted for telescopicmovement with respect to said reciprocating trough section. and meansoperable by reciprocable movement of the conveyer for moving saidextensible trough. section relatively to Said reciprocating troughsection includingr a carrier member disposed beneath and extendingtransversely of said extensible trough section and having gripping meanscarried thereby adapted to engage said extensible trough section duringcertain strokes of the conveyer, and two movable links pivotallyconnected between opposite ends of said carrier member and havingadjustable connection with said reciprocating trough section, either oneof said links being movable to a position to positively lock the end ofsaid carrier member to which it is connected for reciprocable movementkwith said reciprocating trough section, to cause said locked link toexert a force on said carrier member to grippingly engage said grippingmeans with said extensible trough section during certain strokes of theconveyer, and to exert a force on said carrier member in an oppositedirection to release said gripping means during the opposite strokes ofthe conveyer.

13. In a feeding mechanism for shaker conveyers, a reciprocating trough,`an extensible trough, an inclined carrier member, a pair of grip blocksmounted intermediate the ends of said carrier member, for grippinglyengaging said xtensible trough, two links pivotally connected toopposite ends of said carrier member and each extending in the samegeneral direction as said troughs, means for selectively connect-ing theends of said links to said reciprocating trough so that one link willserve as tension member to increase' the inclination of said carriermember and engage said grip blocks with said extensible trough duringcertain strokes of the reciprocating trough in one direction, and theother link will serve as a compression member to increase theinclination of said carrier member and enga-ge said grip blocks withsaid extensible trough during certain strokes of the reciprocatingtrough in an opposite direction.

14. In a feeding mechanism for shaker conveyers, a reciprocating trough.an extensible trough, an inclined carrier member, a pair of grip blocksmounted intermediate the ends of said carrier member, for grippinglyengaging said extensible trough, two links pivotally connected toopposite ends of said carrier member and each extending in the samegeneral direction as said troughs, means for selectively connecting theends of said links to said reciprocating trough so that one link willserve as tension member to increase the inclination of said carriermember and engage said grip blocks with said extensible trough duringcertain strokes of the reciprocating trough in one direction, and theother link will serve as a compression member to increase theinclination of said carrier member and engage said grip blocks with saidextensible trough during certain strokes of the reciprocating trough inan opposite direction, and yieldable means for urging said carriermember to a gripping position immediately upon the gripping stroke ofeither of said links.

15. In a feeding device for shaker conveyers, a reciprocating trough, anextensible trough, an inclined carrier member having a pair of gripblocks mounted intermediate its ends, for gripping engagement with saidextensible trough, a link pivotally connected to one end of said carriermember, means adjustable in one position for connecting the other end ofsaid link in relatively fixed relation to said reciprocating trough soas to move said grip blocks into gripping engagement with saidextensible trough during movement of said reciprocating trough in onedirection, and release said grip b-locks from said extensible troughduring movement of said reciprocating trough in an opposite direction,to feed said extensible trough in one direction, and adjustable toanother position for releasing said link from its xed connection, andanother link pivotally connected to the opposite end of said carriermember having means adjustable in one position for connecting its `otherend in relatively fixed relation tov said reciprocating trough so as tomove said grip blocks into gripping engagement With saidy reciprocatingtrough during movement of said reciprocating trough in one direction andrelease said grip blocks from said extensible trough during movement ofsaid reciprocating trough in an opposite direction to feedV saidextensible trough in an opposite direction,vand adjustableto anotherposition for releasing said link from its fixed connection.

16. In a feeding device for'shaker conveyers, a reciprocating. trough,an extensibler trough, an inclinedicarrier member having a pair of gripblocks mountedl intermediate its ends, for grippingvengagement'` withsaid extensible trough, a linkv` pivotallyconnected to one end oi' saidcarriermember,y means. adjustable in one position for; connecting `theother end of said link in relatively fixed relation to saidreciprocating trough soas'to move said grip blocks into gripping,engagement with said extensible trough during movement of saidreciprocating trough inv one direction, and release said grip blocksfrom'said` extensibleA trough during movement of said reciprocatingrtrough 'in ani opposite. die rection, torfeed saiceafrtensible` troughinv one direction, vand adjustable to anotherv position for releasingsaid link from' itsfixed connection, and another link pivotallyconnectedto the opposite end of said carrier memberhavingmeansadjustable. in" one position for connecting its other end inkrelatively fixed' relation to said reciprocating trough so as tomovexsaid grip-blocks into gripping engagement with said reciprocatingtrough during movement of said reciprocating trough in one direction andrelease said grip blocks from said extensible. troughfduring movement ofsaid reciprocating trough in an opposite direction to feed saidVextensible troughin `an opposite direction, and adjustable -to anotherposition for rreleasing said link from its fixed connection, andyieldable; 4tension vmeans'normally acting on theopposite ends. `of-saidvcarrier member to vurge the latter `intoritsgripping positionimmediately uponthe gripping strokeof either of said links. Y

ERNST R.. BERGMANN.

